Magnetic Properties and Synthesis of Ferrites
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Abstract
Abstract
This study investigates the effect of fuel chemistry and oxidizer-to-fuel ratio on the synthesis of Sr–Fe–O nanoparticles by gel combustion and evaluates their magnetic properties, cytotoxicity, and magnetic hyperthermia performance. Rietveld refinement revealed a multiphase crystalline structure dominated by Fe 3 O 4 (71.4–92.6%), accompanied by different Sr-containing phases, including Sr 2 FeO 4 , Sr 5 Fe 6 O 15 , Sr 3 Fe 2 O 6 , and residual SrCO 3 , depending on fuel type and Ψ. Increasing Ψ strongly reduced the Sr 2 FeO 4 fraction, while citric acid favored the formation of Sr 5 Fe 6 O 15 and TRIS favored Sr 3 Fe 2 O 6 . These results demonstrate that fuel chemistry and oxidizer-to-fuel ratio govern not only particle size and magnetic response but also the phase-evolution pathway of the Sr–Fe–O system. Cytotoxicity tests showed cell viability above 85 % for all samples, indicating biocompatibility. Among the investigated compositions, SrAcΨ0.8 showed the best hyperthermia response, reaching 45 °C rapidly and presenting the highest SAR value.
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@article{Rodrigues2026Fuel,
title = {Fuel-dependent tailoring of magnetic properties in strontium ferrite nanoparticles (SrFe2O4) synthesized via gel combustion for enhanced magnetic hyperthermia performance},
author = {Januara Rodrigues and João Lucas Nicolini and Angélica de Souza Goulart and A. D. C. Viegas and Marcos A.Z. Vasconcellos and Edgar Andrés Chavarriaga Miranda and Jaqueline Leite Vieira and Josiane Dantas Viana Barbosa and Milena Botelho Pereira Soares and Tiago Bender Wermuth and Oscar Rubem Klegues Montedo and Sabrina Arcaro},
journal = {Materials Chemistry and Physics},
year = {2026},
doi = {10.1016/j.matchemphys.2026.133222},
url = {https://doi.org/10.1016/j.matchemphys.2026.133222}
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